Gantner, Nikolaus; Power, Michael; Iqaluk, Deborah; Meili, Markus; Borg, Hans; Sundbom, Marcus; Solomon, Keith R; Lawson, Greg; Muir, Derek C G (2010): Isotopic signatures and mercury content of arctic char and their prey, and water chemistry of 18 arctic Canadian lakes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810149, Supplement to: Gantner, N et al. (2010): Mercury concentrations in landlocked Arctic char (Salvelinus alpinus) from the Canadian Arctic. Part I: Insights from trophic relationships in 18 lakes. Environmental Toxicology and Chemistry, 29(3), 621-632, https://doi.org/10.1002/etc.95
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Abstract:
Concentrations of mercury (Hg) have increased slowly in landlocked Arctic char over a 10- to 15-year period in the Arctic. Fluxes of Hg to sediments also show increases in most Arctic lakes. Correlation of Hg with trophic level (TL) was used to investigate and compare biomagnification of Hg in food webs from lakes in the Canadian Arctic sampled from 2002 to 2007. Concentrations of Hg (total Hg and methylmercury [MeHg]) in food webs were compared across longitudinal and latitudinal gradients in relation to d13C and d15N in periphyton, zooplankton, benthic invertebrates, and Arctic char of varying size-classes. Trophic magnification factors (TMFs) were calculated for the food web in each lake and related to available physical and chemical characteristics of the lakes. The relative content of MeHg increased with trophic level from 4.3 to 12.2% in periphyton, 41 to 79% in zooplankton, 59 to 72% in insects, and 74 to 100% in juvenile and adult char. The d13C signatures of adult char indicated coupling with benthic invertebrates. Cannibalism among char lengthened the food chain. Biomagnification was confirmed in all 18 lakes, with TMFs ranging from 3.5 ± 1.1 to 64.3 ± 0.8. Results indicate that TMFs and food chain length (FCL) are key factors in explaining interlake variability in biomagnification of [Hg] among different lakes.
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Coverage:
Median Latitude: 74.295945 * Median Longitude: -85.003728 * South-bound Latitude: 61.280000 * West-bound Longitude: -107.750000 * North-bound Latitude: 82.110000 * East-bound Longitude: -67.480000
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Gantner, N; Power, M; Iqaluk, D et al. (2010): (Table 1) Stable isotopes, mercury species and trophic level of arctic char (S. alpinus) and their prey. https://doi.org/10.1594/PANGAEA.810147
- Gantner, N; Power, M; Iqaluk, D et al. (2010): (Table 3) Selected surface water chemistry of 18 arctic Canadian lakes. https://doi.org/10.1594/PANGAEA.810148